0.8.18.31:

0.8.18.31:
	Some number-related x86-64 fixes.
	* Fix backend bug in negative counts for ASH. (Patch by Lutz Euler
          on sbcl-devel, 2005-01-09). Add some more ASH tests.
        * Cargo-cult signed modular arithmetic changes from the x86
          backend.
        * Remove optimization of constant multiplication to shifts, adds
          and leas (except for the simple cases of 2^x, 3, 5, 9) from
          the x86-64 backend. It was a lot of code that's not really
          of any use on any existing x86-64 processor.
	* Fix 32-bit assumptions in deftransform of word-sized RANDOM
          integers.